Hi, I have been searching around here for a answer to this but havent been able to get it answered so I thought I'd ask. We were comeing home from our camping trip in the mountains and up a small hill when all of a sudden the turbo started surging from about 30 psi to 10 psi and bouncing back and forth. The turbo sounded like it was "coughing" or probably "barking"( I was at around 2100-2600 rpm I can't remember for sure). I backed off the throttle and down shifted to fifth gear and it steadied out, I slowed down from 110 km/h to about 80 km/h. This was the first time it has ever done this, after I put it in cruse control and no problems. Would it have been my heavy foot that caused it or even the cold air being sucked into the motor the truck is new with about 11,000 km and the trailer is light about 6000 lbs ill assume. any help would be great thanks a lot. I love this site and my truck